LeetCode 706:How to Design a HashMap from Scratch

Welcome back to Lemma! In this video, we tackle LeetCode 706: Design HashMap. Have you ever wondered how hash tables actually work under the hood? We will build a fully functional HashMap from scratch in Python, strictly without using any built-in dictionary or hash table libraries. Key Takeaways from this video: Understanding the Hash Function and choosing a prime number (like 2069) for optimal memory use. The Pigeonhole Principle and why hash collisions are inevitable. Handling collisions using the Chaining method with buckets. Step-by-step implementation of the put(), get(), and remove() methods. Comparing the Chaining approach against a Direct Array approach to see which is more space-efficient. Whether you are preparing for coding interviews or just brushing up on your fundamental data structures, this step-by-step visual tutorial will give you a deep understanding of hash maps. Subscribe to Lemma for more visually animated LeetCode solutions and computer science concepts! #LeetCode #DesignHashMap #Python #DataStructures #CodingInterview #Lemma #Algorithms #Programming